herdr tmux/cmux: Recognize Command Code (cmd) as an agent with notification support

Feature Description

Add first-class support for Command Code (cmd) as a recognized agent type within herdr when running inside tmux or cmux terminal sessions.

Currently, herdr detects and manages the following agents correctly:

• antigravity
• codex
• claude etc

However, cmd (Command Code) agents are not recognized by herdr in the same terminal context. They run silently — not listed in herdr's agent registry, and no notifications fire in herdr or cmux when they are triggered.

The fix should include:

1. Adding cmd / Command Code to herdr's agent detection/recognition logic
2. Enabling notification hooks for cmd agents in both herdr and cmux (on par with metoo notification behavior for existing agents)
3. Ensuring full parity with claude, codex, and antigravity agent handling inside tmux/cmux sessions

Use Case

Developers using herdr to orchestrate multiple AI agents inside tmux or cmux sessions need Command Code agents to be visible and manageable alongside other agents (claude, codex, antigravity).

Without this support:

• cmd agents run as untracked processes — no status visibility in herdr
• No notifications fire when a Command Code agent completes a task or needs attention
• Breaks multi-agent workflows where herdr is the central orchestration layer

With this support, Command Code becomes a first-class citizen in herdr's agent ecosystem, enabling seamless use alongside other recognized agents in terminal-based multi-agent setups.

Additional Context

https://herdr.dev https://cmux.com

How important is this to you?

Blocking adoption or production use

Commencez par localiser la logique de détection des agents et du registre de herdr pour le comportement de claude, codex, antigravity et metoo dans les sessions tmux ou cmux. Suivez les hooks de notification et vérifiez que cmd est reconnu, répertorié et notifié avec un comportement équivalent ; confirmez le résultat dans les workflows de herdr et de cmux.